Cho'gall, once a key executor of the nihilistic Twilight's Hammer's vision, has been struck down. Lady Sinestra, consort of Deathwing and mother to the malevolent black dragons Nefarian and Onyxia, has fallen at the hands of great heroes. Ragnaros, lord of the realm of fire in the Elemental Plane, and Al’Akir, baron of the realm of air -- both mighty arbiters of Deathwing's destructive ends -- have themselves been purged. But even with so many of Deathwing's servants now vanquished, he freely roams the skies of Azeroth, wreaking havoc on the land and its people. It's in these darkest of hours that the forces standing against Deathwing must carry out a desperate plan to put an end to his devastating twilight flight.

The other Dragon Aspects, with allegiance from Thrall, have devised a dangerous and unorthodox strategy to bring Deathwing down once and for all. But to do so, they must acquire the Dragon Soul from a pivotal moment in the distant past... and they're going to need your help. In patch 4.3, level-85 players will gain access to three new Heroic-difficulty five-player dungeons, embarking on quests to aid the Aspects and other familiar faces in a fight against Deathwing, the Twilight's Hammer, ancient armies of the Burning Legion and Highborne... and even time itself.

Much like the experience in the five-player content of Icecrown Citadel, players must quest through these dungeons sequentially to unlock access to them in the Dungeon Finder. You'll also be afforded the opportunity for all-new epic loot, including new dungeon sets. While these sets aren't broken down by class and contain no set bonuses, they offer cohesive aesthetic looks for each armor type: cloth, leather, mail, and plate. These set pieces can be taken from the grasps of defeated bosses in each of the new Heroic dungeons.

Now read on for a taste of what lies ahead and -- interestingly enough -- behind you in the first of these three new dungeons: End Time.

End Time
One of an infinite number of potential outcomes, this timeway depicts the desolate future of Azeroth should its defenders fail to stop Deathwing. In this bleak future, Nozdormu has identified an anomaly that bars access to both the past and the Dragon Soul: a powerful creature from out of time, living alone amid time-twisted echoes of the past.
In order for Nozdormu to provide you the ability to travel back in time to a point before the Dragon Soul was hidden by Malfurion Stormrage from anyone who’d seek its power, you must first go to a distant and desolate future to discover the anomaly blocking the past. You'll find yourself in a very different Dragonblight, stripped of its snowy landscape, with little more than ruins of the once-great dragonshrines. Wyrmrest Temple itself stands only as a reminder of Deathwing's madness -- what's left of his scorched remains is impaled atop the structure.

Before you confront the creature disrupting Nozdormu's access to the past, you'll first be called to fight any two of the following four ostensibly familiar leaders, chosen at random each time you play through End Time.

Excerpts from the Dungeon Journal

Echo of Sylvanas: Spawned from shattered timeways and cloistered within the Ruby Dragonshrine, a maddened fragment of the Forsaken's leader, Sylvanas Windrunner, waits restlessly. Having lost everything and unable to find peace, this tormented echo aches for a chance to unleash her dark fury at anything still living within these barren, time-twisted wastes.

Echo of Tyrande: Once high priestess of Elune and leader of the night elves, this time-twisted fragment of Tyrande Whisperwind now wanders the desolate future of Azeroth. Enveloped by eternal midnight, she is forever separated from the comforting light of Elune and torn by questions about why her goddess did nothing to put an end to such madness.

Echo of Jaina: The tormented fragment of Jaina Proudmoore has been split and infused within the shattered pieces of her staff. To restore balance to the timeways, this echo must be defeated. However, the devastating magical power possessed by the once-proud ruler of Theramore is hardly lost to her time-havocked spectre. In this future Azeroth, she is only divided, and waiting....

Echo of Baine: Enraged by his failure to protect the world and, most importantly, the Horde, this time-ravaged shade of Baine Bloodhoof lingers within the ruins of the Obsidian Dragonshrine. Although he's still as powerful as the tauren high chieftain from the present, within this shattered future Azeroth, this guilt-ridden echo is little more than a discordant vessel of unquenchable malice and anger.

These long-dead heroes are mere echoes of their former glory, further warped by the corruptive force of time. Their presence here is a great mystery, even to Nozdormu. Once these shades have been laid to rest, the maniacal figure blocking Nozdormu's vision will be revealed at the Bronze Dragonshrine. None of the Dragon Aspects could have predicted what entity would have such power to interrupt the sight of the Timeless One… the ability to create a new and infinite dragonflight. Only by destroying a mysterious dragon known as Murozond will you give Azeroth's protectors the opportunity to avoid the potential outcome to which your eyes bear witness.

Stay tuned for part two of our patch 4.3 dungeons preview: Well of Eternity.

Aspects are the ones which keep the old golds locked away because of their life force or some werid shiz so this is supposed to be in a future where the Hour of Twilight happened and in order for it to actually happen and for the Old Gods to control Azeroth, all dragon aspects must die - even deathwing himself

As to how he was impaled on the temple.. well I have not the slightest idea

Was the Dragon soul (the demon soul) not destroyed by Rhonin once Alextrasza was freed from orcish capture? And if we take it from the past, would that not mean that the dragonmaw clan does not find it, and would not be able to hold back the Life-Binder? Which means Day of the Dragons ... never happened?

He's just a means to an end for the Old Gods. Their plans to gain freedom have stretched for ages and (granted, non-cannon) as stated in the book, even Sargeras was said to be weaker than the Old Gods are. So I'd imagine that sicne they're now free in this timeline... they dispose of loose ends.

Was the Dragon soul (the demon soul) not destroyed by Rhonin once Alextrasza was freed from orcish capture? And if we take it from the past, would that not mean that the dragonmaw clan does not find it, and would not be able to hold back the Life-Binder? Which means Day of the Dragons ... never happened?

Well, it was hidden for 10000 years until the dark horde found it. That's a long time period for Nozdormu to retrieve it, have thrall use it and put it back again.

Saw it coming across the ages...but yeah. If everything else in that future is twisted, why wouldn't Nozdormu be? Makes sense that a twisted, warped Nozdormu would be looking back across timelines and f-ing them up to prevent the future that he's in (or just re-tooling timelines for the Old Gods)